Method for locating fault through travelling wave natural frequencies at two ends of electric transmission line

A natural frequency and transmission line technology, applied in the fault location and other directions, can solve the problems of insufficient positioning accuracy of single-phase faults and long-distance faults, high requirements for the identification accuracy of the main natural frequency of traveling waves, and inability to eliminate the length of the line. Ineffective, simplified calculation, improved accuracy

Active Publication Date: 2014-03-05
WUHAN UNIV +1
View PDF6 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing fault location method based on the natural frequency of traveling wave has high requirements on the identification accuracy of the main natural frequency of traveling wave, and there is a problem that the location accuracy of single-phase fault and long-distance fault is seri

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for locating fault through travelling wave natural frequencies at two ends of electric transmission line
  • Method for locating fault through travelling wave natural frequencies at two ends of electric transmission line
  • Method for locating fault through travelling wave natural frequencies at two ends of electric transmission line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be further elaborated below in conjunction with specific embodiments and accompanying drawings.

[0027] The technical solution adopted in the present invention is: a fault location method using the natural frequency of traveling waves at both ends of the transmission line, comprising the following steps:

[0028] Step 1: Send the three-phase fault current collected by the fault recording device at both ends of the transmission line to the host computer, select the corresponding reference phase according to the fault type of the line, and perform phase-to-mode conversion to obtain the selected mode current signal X m 、X n And perform filtering processing, wherein, the subscript m indicates that the quantity is a parameter of the line m terminal, and the subscript n indicates that the quantity is a parameter of the line n terminal.

[0029] Step 2: The identification of the main natural frequency of traveling wave adopts the atomic decompositi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for locating a fault through the travelling wave natural frequencies at the two ends of an electric transmission line and belongs to the technical field of fault locating of electric transmission lines. According to the method for locating the fault through the travelling wave natural frequencies at the two ends of the electric transmission line, fault currents at the two ends of the electric transmission line are processed based on the atomic decomposition algorithm, main travelling wave natural frequency values at the two ends of the electric transmission line are determined based on atoms generated through iteration, the main travelling wave natural frequency values are corrected and calculated, the ratio of the length of a faulty line to the total line length is determined according to the inverse ratio of the corrected main travelling wave natural frequency values at the two ends of the electric transmission line, and therefore the position of a fault point is determined according to the distribution positions of poles and towers of the electric transmission line. By the adoption of the method for locating the fault through the travelling wave natural frequencies at the two ends of the electric transmission line, the main natural frequency value of the fault currents can be accurately determined, the fault locating precision is high, and a result is reliable.

Description

technical field [0001] The invention belongs to the technical field of transmission line fault location, and relates to a fault distance measurement method using the natural frequency of traveling waves at both ends of the transmission line. Background technique [0002] Accurate fault location of transmission lines is an important measure to ensure the safe and economical operation of the power grid, and it is a research difficulty and hotspot in the field of power systems. The existing fault location methods based on the natural frequency of traveling waves have high requirements on the identification accuracy of the main natural frequency of traveling waves, and there are serious problems in the location accuracy of single-phase faults and long-distance faults. At the same time, the existing traveling wave natural frequency fault location method only uses the electrical quantity at one end of the line to determine the location of the fault point, and the location result c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R31/08
Inventor 龚庆武徐高李勋张英杰
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap